Quantum discord of thermal states of a spin chain with Calogero-Moser type interaction

被引：21

作者：

Ma XiaoSan ^{[1
]}

Qiao Ying ^{[1
]}

Zhao GuangXing ^{[1
]}

Wang AnMin ^{[2
]}

机构：

[1] Anhui Univ Technol, Sch Elect Engn & Informat, Maanshan 243002, Peoples R China

[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China

来源：

SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2013年 / 56卷 / 03期

基金：

中国国家自然科学基金;

关键词：

quantum discord; entanglement of formation; Calogero-Moser interactions; CRYPTOGRAPHY; INFORMATION;

D O I：

10.1007/s11433-012-4870-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper, we have investigated the effect of Calogero-Moser type interaction on the quantum discord of thermal states of a spin chain. Our results imply that the quantum discord depends on the relative distance between the spins, the external magnetic field, and the temperature. By a comparison between the quantum discord and the entanglement of formation, the quantum discord is more robust than the entanglement of formation in the sense that the latter takes a zero value in a large range of the parameters, while the former takes a nonzero value.

引用

页码：600 / 605

页数：6

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